Experienced and professional animal trainer provide their insights in answering this question :
A. 2 years old is when he is fully mature. You should have his hips and knees checked and all of his health clearances done before breeding to be sure that nothing will be passed onto future pups. checking his eyes and heart also are very good ideas.

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On average, however, males become fertile after six months of age and reach full sexual maturity by 12 to 15 months. Healthy stud dogs may remain sexually active and fertile to old age. Adult males are able to mate at any time.
How Long Does it Take for a Male Dog to Ejaculate? Ejaculation occurs throughout the duration of the copulatory tie. The main payload is ejaculated in the first two minutes. More specifically, the second fraction should be ejaculated within 80 seconds of the tie.
3-6 puppies.
The expected lifespan for a Miniature Pinscher is 10-14 years, but it is not unheard of for these pups to live up to 16 years of age. Your dog`s life expectancy can be determined by many factors, including their diet and exercise routine. It is also helpful to factor in if your dog has any health issues.
The onset of puberty will be most recognizable in your male dog. He`ll begin lifting his leg to mark territory and mounting other dogs, humans, and even furniture. It`s not unusual to discover a puddle of urine, left by a formerly housebroken adolescent dog.
As with anything else, different veterinarians will have a different opinion on the best age to start breeding your male dog. However, most veterinarians recommend waiting until at least six months, with many pushing that back to a year.
Dogs remain stuck together at the end-stage of mating for five to 45 minutes, says Greer. The male dog dismounts and ends up rear-to-rear with the female. Dogs new to mating may experience a bit of anxiety at being locked together, but it`s a natural process.
The fertility rate in a slip mating is not quite as good, as there is often some spillage of semen when withdrawal occurs prior to the locking phase. However, conception is still possible and even likely, providing ejaculation occurred prior to the dogs` separating.
Minpins love cuddling, but when they want to do it. Although they don`t mind a show of affection, they prefer to get it when they want to feel loved. And if a minpin has decided that it`s cuddle time, then it will be cuddle time no matter what. In other words, miniature pinschers can be a little clingy at times.
Many people think that they were developed by breeding Dobermans to progressively smaller sizes, and indeed, they look similar to Dobermans. However, the Min Pin is a distinct and much older breed. Even though these are purebred dogs, you may find them in the care of shelters or rescue groups.
Miniature Pinschers are social and playful animals with a high affection for families and children. However, they can get rough with children and aggressive with other dogs. They are active, making them one of the best watchdog breeds.
Alone Time

Though they may be left alone for four to six hours per day—preferably in a dog-proofed area or crate for safety—Miniature Pinschers may become destructive or bark excessively if they don`t get enough exercise or attention throughout the day.

Dogs usually have their first heat at around 6 months old, and then every 6-7 months afterwards. Each heat tends to last approximately 16-18 days. Signs of a heat include a swollen vulva (private parts), bleeding, and changes in behaviour.
Dog puberty usually occurs when your pup is between 7 months and 2 years old and as with humans, it can bring a whole load of behavioural and physical changes.
Assuring Your Dog is Fertile

A male dog usually reaches sexual maturity when they are over a year old, however they usually begin puberty when they are six months to eight months old. They can impregnate a female dog from the point of puberty on.

After about 9-10 days, the bleeding will become more watery, or stop. It is at this time your female will, most likely, be at her most fertile. This proestrus stage can last as long as 20 days in some dogs. So the end of bleeding can be a more useful indicator of peak fertility.
Male dogs don`t have a clear reproductive cycle like female dogs, so if your dog is intact, you may look for signs your male dog wants to mate. Most unneutered males can breed all the time, so how much they want to mate depends on whether they smell a female in heat nearby or their health.
There`s a relatively small window when your dog is most fertile during the heat cycle; it may begin about nine or ten days after she goes into heat and lasts about five days. However, she can become pregnant until the end of the cycle.
Don`t do anything to try to separate the dogs, especially pull them apart by force, which could hurt them! Stay calm and wait for the dogs to unstick themselves. If they`re still stuck together after an hour (which is unlikely to happen), call your vet to get advice.
Male dogs will be attracted to a female dog for the full 18 days, but the female dog will only be receptive to males for about half that time.
A whopping 40% of female dogs will fall pregnant after just one mating session! That incredibly high number means you are at considerable risk of having a litter of unwanted puppies if you are not careful.
If different males mate with the female on different days, she can fall pregnant by both of them. This is because the sperm survive for days in her tract, and are ready and waiting when she does ovulate.
Miniature Pinschers are very smart and love their families, but they can also be independent and may try to test their owner`s limits, so obedience training is a good idea. Early socialization and puppy training classes are recommended and help to ensure that the dog grows into a well-adjusted, well-mannered companion.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My unfixed grown male dog is slobbering and trying to mount my new male puppy. What’s that about?
ANSWER : A. Mounting behavior can be both a sexual thing in dogs, or a behavioral one. If both dogs are male, it may be that your older dog is trying to establish that he is the boss of the house by trying to mount your younger one. Stopping the behavior is best to prevent any fights from breaking out. Both female and male dogs can do this to each other, and spay/neuter status does not usually play any factor if behaviorally related.

If your younger dog is female, or not spayed, and is about 6-7 months of age, it may be that she is coming into her first heat and your male is very interested in her. Dogs should not be bred during their first heat, and if you do not wish to have puppies in the future, one or both dogs should be fixed.

Q. Male neutered cat [1 1/2 years old] has just started trying to spray everywhere around the house. Nothing is coming out. No recent changes.
ANSWER : A. Changes in urinary habits can be caused by a number of things, especially in neutered male cats. Attempting to urinate or have accidents in places other than the litter box can often be a sign of a urinary tract infection, or crystals and debris in the bladder causing problems. Pets may need to go more frequently, may dribble or urinate in small amounts more often, may have accidents or may have blood-tinged or cloudy urine.Infections are usually treated with medications and changes to the diet, however in some cases of large stones or crystals surgery may be needed.

Male cats can also experience urinary blockage. This is due to a unique anatomical part or the urethra that forms a U-shape before exiting the body in male cats. If a cat has crystals or other debris in the urine, it can block at this point preventing urine from being able to exit. Cats may attempt to urinate without producing anything, may become very vocal (indicating pain) or may have a hunched back, full abdomen or pain in the abdomen (protecting the very full bladder). Urinary blockage IS a medical emergency so if suspected, your vet or local emergency clinic should be contacted immediately. Treatment usually involves a hospital stay and catheterization of the bladder to remove the blockage and allow urine to drain followed by medications and a change in diet to prevent further problems.

It is best to try and collect a sample of urine and make an appointment for your cat if he has had a change in urinary habits. If you do suspect a blockage, then contact your vet ASAP is best.

Q. I have 2.5 yr male,neutered Scottie. Which would you suggest is better for a new companion- same age dog or puppy, male or female?
ANSWER : A. Same age approximately is better, male or female doesn’t matter as long as he/she is neutered/spayed.

Q. At what age is my male mini pin able to mate
ANSWER : A. 2 years old is when he is fully mature. You should have his hips and knees checked and all of his health clearances done before breeding to be sure that nothing will be passed onto future pups. checking his eyes and heart also are very good ideas.

Q. What is the age a male dog needs to be in order to reproduce?
ANSWER : A. Male dogs are capable of reproducing by the age of 6-8 months. I would not recommend breeding before two years of age as to allow the dog to properly develop and for the owner to assess the dog’s health and behavioral quality.

Q. I recently added a new 2 month old female kitten to my house and my male 5 month the old kitten has turned aggressive and chases the kitten down..
ANSWER : A. It is possible it could be play behavior but without seeing it in person, hard to say. Is the male kitten neutered? You may want to consider doing so. Also, try re-introducing the kittens slowly by creating a safe space for the new kitten behind a closed door in a room. Keep her there for at least a week so she is protected but your male is still able to smell her. After a week or 2, you can then graduate to using a baby gate so they can then not only smell each other but safely see each other as well. If that is going okay, after another few days you can bring the gate down. Also, be sure to have feeding bowls in separate locations and at least 2 litter boxes.

Read Full Q/A … : Ragdoll Cats

Q. Male or Female?
ANSWER : A. Male and female dogs each have their own characteristics. Some are good tempered, while some are bad. There is no superior sex when it comes to dogs, so it is entirely up to the owner’s preference as to whether a male or a female dog will be best. What is important is that a dog is trained and disciplined, starting at an early age, so to curb some of the bad traits that can occur due to lack of training.

Q. our indoor female cat got a whiff of an outdoor male cat and is now lashing out at everyone, including us and our other indoor cat. Help!
ANSWER : A. This behavior is called displaced aggression. Your indoor cat is very upset about the outdoor male cat but is unable to do anything directly about him, so she instinctively lashes out at anyone or thing that comes near her. She is defending herself and her territory from the outdoor male cat – just defending it from the wrong people/cat. Don’t worry she should calm down as long as the outdoor male isn’t hanging around and continuing to annoy her. If it is, try temporarily block her view out the window/door and purchase Feliway pheremone spray or diffuser. Feliway imitates the facial pheremones of cats, helping to calm them and make them feel more secure. Feliway can be purchased in most petstores, online, or at your veterinarians. If you continue to have problems, I would be happy to consult with you individually to help resolve the situation.